Process to make calcium oxide or ordinary portland cement from calcium bearing rocks and minerals
US-2024383804-A1 · Nov 21, 2024 · US
Inorganic acids
Inorganic acids · Cooperative Patent Classification (CPC)
Chemical and metallurgical processes, compounds, and materials.
Related technology areas
Mapped technology topics for this CPC code.
| Metric | Value |
|---|---|
| CPC code | C25B1/22 |
| Official title | Inorganic acids |
| Display label | Inorganic acids |
| Total patents | 69 |
Filing trend
Year-over-year patent counts classified under this CPC code.
Filing activity over the last five years is stable.
| Year | Patents |
|---|---|
| 2015 | 5 |
| 2016 | 2 |
| 2017 | 5 |
| 2018 | 5 |
| 2019 | 2 |
| 2020 | 3 |
| 2021 | 7 |
| 2022 | 8 |
| 2023 | 9 |
| 2024 | 14 |
| 2025 | 8 |
| 2026 | 1 |
Representative patents
Representative publications under this CPC code from precomputed stats, or recent filings when stats are unavailable.
Method for preparing hydrogen sulfide from sulfur dioxide by electrochemical reduction
US-12129566-B2 · Oct 29, 2024 · US
Extraction of ammonia and sulfuric acid from ammonium-sulfate-rich (waste) waters
US-2024335793-A1 · Oct 10, 2024 · US
Process to convert reduced sulfur species and water into hydrogen and sulfuric acid
US-12110601-B2 · Oct 8, 2024 · US
Process for producing lithium hydroxide
US-2024240330-A1 · Jul 18, 2024 · US
Hydrogen sulfide conversion
US-2024229251-A9 · Jul 11, 2024 · US
Gas-less eluent generator
US-2024209517-A1 · Jun 27, 2024 · US
Electrochemical phosphate removal and recovery cells
US-2024200203-A1 · Jun 20, 2024 · US
Carbon dioxide electrolysis apparatus
US-2024167168-A1 · May 23, 2024 · US
Sulfuric acid production with mineral carbon sequestration
US-2024149240-A1 · May 9, 2024 · US
Chemical reaction devices involving acid and/or base, and related systems and methods
US-2024133054-A1 · Apr 25, 2024 · US
Hydrogen sulfide conversion
US-2024133049-A1 · Apr 25, 2024 · US
Chemical reaction devices involving acid and/or base, and related systems and methods
US-2024124987-A1 · Apr 18, 2024 · US
Electrolyzers
US-2024035172-A1 · Feb 1, 2024 · US
Dual-membrane on-line generator for acid or alkali solution
US-11827990-B2 · Nov 28, 2023 · US
Hypochlorous acid generating electrode
US-2023357938-A1 · Nov 9, 2023 · US
Process to make calcium oxide or ordinary portland cement from calcium bearing rocks and minerals
US-2023339807-A1 · Oct 26, 2023 · US
Method for clean recovery of palladium
US-2023340681-A1 · Oct 26, 2023 · US
Method for manufacturing sulfuric acid solution and electrolyzer used thereof
US-11781228-B2 · Oct 10, 2023 · US
Process to make calcium oxide or ordinary Portland cement from calcium bearing rocks and minerals
US-11718558-B2 · Aug 8, 2023 · US
Frequently asked questions
Answers are generated from the same data shown on this page.
- What is CPC C25B1/22?
- CPC C25B1/22 is the Cooperative Patent Classification code for “Inorganic acids.”
- How many patents are filed under CPC C25B1/22 (Inorganic acids)?
- Our database includes 69 publications tagged with this CPC code.
- Is patent activity under CPC C25B1/22 growing?
- Publication counts under this code: 14 in 2024 vs 8 in 2025 (latest complete years).